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NCP1521 데이터시트 PDF




ON Semiconductor에서 제조한 전자 부품 NCP1521은 전자 산업 및 응용 분야에서
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부품번호 NCP1521 기능
기능 Adjustable Output Voltage Step-Down Converter
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NCP1521 데이터시트, 핀배열, 회로
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NCP1521
1.5 MHz, 600 mA,
High−Efficiency, Low
Quiescent Current,
Adjustable Output Voltage
Step−Down Converter
The NCP1521 step−down PWM DC−DC converter is optimized for
portable applications powered from one cell Li−ion or three cell
Alkaline/NiCd/NiMH batteries. The device is available in an adjustable
output voltage from 0.9 V to 3.3 V. It uses synchronous rectification to
increase efficiency and reduce external part count. The device also has a
built−in 1.5 MHz (nominal) oscillator which reduces component size by
allowing a small inductor and capacitors. Automatic switching
PWM/PFM mode offers improved system efficiency.
Finally, it includes an integrated soft−start, cycle−by−cycle current
limiting, and thermal shutdown protection. The NCP1521 is
available in space saving, low profile TSOP5 and UDFN6 packages.
Features
95.3% of Efficiency for 3.3 V Output and 4.2 V Input and 80 mA
Load−Current
Sources up to 600 mA
1.5 MHz Switching Frequency
Adjustable Output Voltage from 0.9 V to 3.3 V
30 mA Quiescent Current
Synchronous Rectification for Higher Efficiency
2.7 V to 5.5 V Input Voltage Range
Thermal Limit Protection
Shutdown Current Consumption of 0.3 mA
Short Circuit Protection
This is a Pb−Free Device
Typical Applications
Cellular Phones, Smart Phones and PDAs
Digital Still/Video Cameras
MP3 Players and Portable Audio Systems
Wireless and DSL Modems
Portable Equipment
USB Powered Devices
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MARKING
DIAGRAM
5
1
TSOP−5
SN SUFFIX
CASE 483
5
DBPAYWG
G
1
DBP = Specific Device Code
A = Assembly Location
Y = Year
W = Work Week
G = Pb−Free Package
(Note: Microdot may be in either location)
UDFN6
MU SUFFIX
CASE 517AB
16
2 ZCMG 5
3G4
ZC = Specific Device Code
M = Date Code
G = Pb−Free Package
(Note: Microdot may be in either location)
ORDERING INFORMATION
Device
Package
Shipping
NCP1521ASNT1G TSOP−5 3000/Tape & Reel
(Pb−Free)
NCP1521AMUTBG UDFN6 3000/Tape & Reel
(Pb−Free)
†For information on tape and reel specifications,
including part orientation and tape sizes, please
refer to our Tape and Reel Packaging Specification
Brochure, BRD8011/D.
VIN
CIN
OFF ON
1 VIN LX 5
2 GND
3 EN
FB 4
L
COUT
Figure 1. Typical Application − TSOP−5
VOUT
OFF ON
R1 Cff
R2
VIN
1 EN FB 6
2 GND LX 5
R2
2.2 mH R1
3 VIN GND 4
4.7 mF
18 pF
VOUT
10 mF
Figure 2. Typical Application − UDFN6
© Semiconductor Components Industries, LLC, 2006
July, 2006 − Rev. 4
1
Publication Order Number:
NCP1521/D




NCP1521 pdf, 반도체, 판매, 대치품
NCP1521
ELECTRICAL CHARACTERISTICS (Typical values are referenced to TA = +25°C, Min and Max values are referenced −40°C to
+85°C ambient temperature, unless otherwise noted, operating conditions VIN = 3.6 V, VOUT = 1.8 V, unless otherwise noted.)
Characteristic
Symbol
Min Typ Max Unit
Input Voltage Range
Undervoltage Lockout (VIN Falling)
Quiescent Current
PFM No Load
VIN
VUVLO
Iq
2.7 − 5.5 V
2.3 2.5 2.6 V
− 30 45 mA
Standby Current, EN Low
Istb − 0.3 1.2 mA
Oscillator Frequency
Peak Inductor Current
Feedback Reference Voltage
FB Pin Tolerance Overtemp @ Iout = 100 mA
Reference Voltage Line Regulation
Fosc
ILIM
Vref
VFBtol
DVFB
1.3 1.5 1.8 MHz
− 1200 − mA
− 0.6 − V
−3.0
3.0 %
− 0.1 − %
Output Voltage Accuracy @ Iout = 100 mA (Note 5)
Minimum Output Voltage
Maximum Output Voltage
Output Voltage Line Regulation (Vin = 2.7–5.5)
Io = 100 mA
VOUT
VOUT
VOUT
DVOUT
−3%
Vnom
0.9
3.3
0.1
+3%
V
V
V
%
Voltage Load Regulation
(IO = 100 mA to 300 mA)
(IO = 100 mA to 600 mA)
VLOADREG
− 0.0005 − %/mA
− 0.001 − %/mA
Load Transient Response (300 mA to 600 mA Load Step, Trise 10 ms)
Duty Cycle
VOUT
− 50 − mV
− − 100 %
P−Ch On−Resistance
RLxH
− 300 − mW
N−Ch On−Resistance
RLxL
− 300 − mW
P−Ch Leakage Current
ILeakH
− 0.05 − mA
N−Ch Leakage Current
ILeakL
− 0.01 − mA
Enable Pin High
VENH 1.2 −
−V
Enable Pin Low
VENL
− − 0.4 V
EN << H >> Input Current, EN = 3.6 V
IENH
− 2.0 − mA
Soft−Start Time
Tstart
Thermal Shutdown Threshold
TSD
Thermal Shutdown Hysteresis
TSDH
5. The overall output voltage tolerance depends upon the accuracy of the external resistor (R1, R2).
350 500 ms
160 − °C
25 − °C
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NCP1521 전자부품, 판매, 대치품
NCP1521
2.0
1.5
1.0 IOUT = 100 mA
0.5
0.0 IOUT = 300 mA
−0.5
−1.0
IOUT = 600 mA
−1.5
VIN = 3.6 V
−2.0
−50 0
50 100
TEMPERATURE (°C)
Figure 19. Output Voltage Accuracy
(VOUT = 0.9 V)
2.0
1.5
1.0
IOUT = 100 mA
0.5
0.0 IOUT = 300 mA
−0.5
−1.0
IOUT = 600 mA
−1.5
VIN = 3.6 V
−2.0
150 −50
0
50 100
TEMPERATURE (°C)
Figure 20. Output Voltage Accuracy
(VOUT = 1.8 V)
150
2.0
1.5
1.0
0.5
0.0
−0.5
IOUT = 100 mA
IOUT = 300 mA
IOUT = 600 mA
−1.0
−1.5
VIN = 4.0 V
−2.0
−50 0
50 100
TEMPERATURE (°C)
Figure 21. Output Voltage Accuracy
(VOUT = 3.3 V)
150
10 ms/Div
VOUT
50 mV/Div
IOUT
200 mA/Div
Figure 22. Load Transient Response in PWM
Operation (VIN = 3.6 V)
VOUT
50 mV/Div
10 ms/Div
IOUT
200 mA/Div
2.5 ms/Div
ILX
500 mA/Div
VOUT
500 mV/Div
Figure 23. Load Transient Response in PWM
Operation (VIN = 3.6 V)
Figure 24. Short Circuit Protection (VIN = 3.6 V)
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